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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Concentration of credit risk (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Advances to suppliers | Supplier | Supplier A |  |
Concentration of credit risk |  |
Advances to suppliers | $ 18,260 | $ 18,260

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- Definition Represents the carrying value of capitalized payments made in advance for inventory to suppliers. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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